Mueller subpoenas second Roger Stone aide

Why it matters: This signals that Mueller's investigation is focusing in on Stone, per Reuters. The second subpoena was served to John Kakanis, who has been an accountant, driver, and operative for Stone. Stone, an adviser to President Trump, told Reuters he believes the investigation of him is founded in "misapprehensions and misconceptions" spun by the media.

Protesters gather north of Lafayette Square near the White House during a demonstration against racism and police brutality, in Washington, D.C. on Saturday evening. Photo: Jose Luis Magana/AFP via Getty Images

Tens of thousands of demonstrators have been rallying in cities across the U.S. and around the world to protest the killing of George Floyd. Huge crowds assembled in Washington, D.C., Philadelphia and Chicago for full-day events on Saturday.